tests/ui/macros/must-use-in-macro-55516.rs


1
2
3
4
5
6
7
8
9
10

// check-pass
// compile-flags: -Wunused

// make sure write!() can't hide its unused Result

fn main() {
    use std::fmt::Write;
    let mut example = String::new();
    write!(&mut example, "{}", 42); //~WARN must be used
}